Microwave or boil the frozen vegetables until tender. Drain the
vegetables and place in a blender or food processor (process in
batches if using a small blender or processor). Add the butter,
chives, and heavy cream.

Puree until the mixture is smooth, but still flecked with dark green
bits of vegetables. Refrigerate if desired. Before serving place
mixture in a saucepan and gently heat until warmed through. Add
nutmeg, salt, and pepper.